New build extension with a shower room.Builders have sited the shower extractor fan directly into the external wall above the shower cubicleThe pull chord will hang into the shower itself and is positioned 2.5 meters above shower tray.Builder has said this is safe as it will be surrounded by tiles with no exposed electrical cabling but as an "oldie" I though fans had to be sited away from water as you risk getting shocked if they get wet.Need to know answers asap as external wall is due to be rendered soon